Republican presidential nominee Donald Trump is expected to receive his first national security briefing this week from intelligence officials, sources said on Tuesday. Representatives from the Office of the Director of National Intelligence will give the New York businessman a wide-ranging briefing on foreign ...

More Republicans broke ranks Tuesday with their party’s White House nominee Donald Trump, issuing dire warnings that his recklessness and lack of policy chops would put the United States in danger. Facing sinking poll numbers and anger in the party over his repeated stumbles ...

Fifty senior Republican national security officials have issued a stinging rejection of their party’s White House nominee Donald Trump, warning he would be “the most reckless president in American history” if elected. The group, some of whom already announced they would not vote for ...

Hillary Rodham Clinton’s use of a private email server to conduct government business when she served as secretary of state was a mistake but didn’t endanger national security, President Barack Obama said during an interview airing Sunday on CBS’s “60 Minutes.” Obama said public ...

President Barack Obama said Wednesday the threat posed by climate change is evident all around and that those who deny the “indisputable” science that it is real are putting at risk the security of the United States and the military sworn to defend it. ...

Warning of a threat to national security, a top South African official on Wednesday condemned an alleged leak of South African intelligence documents and said an investigation is underway. The comments by David Mahlobo, South Africa’s state security minister, followed the publication this week ...

One lesson from Julia Pierson’s short tenure as director of the agency that protects the first family: The Secret Service can’t keep secrets from the president. The undoing of Pierson, who resigned Wednesday, was not telling President Barack Obama about a Sept. 16 incident ...